DocumentCode :
968303
Title :
Passive magnetic bearings with permanent magnets
Author :
Yonnet, Jean-Paul
Author_Institution :
C.N.R.S, E.N.S.E.G.P, France
Volume :
14
Issue :
5
fYear :
1978
fDate :
9/1/1978 12:00:00 AM
Firstpage :
803
Lastpage :
805
Abstract :
The various geometrical dispositions which allow to realize passive magnetic bearings with permanent magnets, have been Known for several decades. Devices running by attraction were the first to be built. When new magnets, which can be used in repulsion appeared on the market (SmCo5), new types of passive magnetic bearings, running by repulsion, started to be made. Up to now, to our knowledge, most of the devices realized have been made with radially magnetized rings. We proved that for identically shaped bearings, strengths and stiffnesses were exactly the same in both magnetic configurations : radial and axial magnetization. The proof is only based on the rigidity of the magnetization. These results are still true for axial or radial passive bearings, and can also be used for devices in attraction. Ring shaped magnets with radial magnetization are usually made of several sectors stuck together. Axial magnetization is much easier to manufacture because large sized rings are already industrially provided.
Keywords :
Magnetic levitation, bearings; Permanent magnet motors; Demagnetization; Electrical equipment industry; Ferrites; Magnetic devices; Magnetic levitation; Magnetic materials; Magnetization; Manufacturing industries; Permanent magnets; Power system reliability;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.1978.1060019
Filename :
1060019
Link To Document :
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